The DEVS really screwed this up huh.
Mage armor is an invisible force that acts as Armor, this armor should not stack with armor bonuses, but supersede them if higher. Now if you are wearing full plate and someone cast mage armor on you, your AC does not increase, but you get a +4 AC bonus to incorporeal attacks since they ignore your normal armor but not mage armor. If your full plate was ghost touch then your AC is +8 against incorporeal attacks not to mention deflection which always counts, dex, dodge, and enhancement to the ghost touch armor.
MT says there are no incorporeal touch attacks, nor any touch attacks at all. So then how does one protect themselves from a Wraith, And why does mage armor show up as a buff in the top corner when cast on my WF with adamantine plate or any other characters that are wearing actual armor, because it is supposed to work against wraiths. The DEVS seem to want it to, but maybe they have not gotten around to perfecting incorporeal attacks (they won't be touch) but incorporeals still do attack and mage armor/ ghost touch should act as AC against them.
I can't believe someone said ghost touch only goes on weapons, hope they meant in DDO though shields are not weapons in my mind even if they can be used as one